ADRF5721

RECOMMENDED FOR NEW DESIGNS

2 dB LSB, 4-Bit, Silicon Digital Attenuator, 9 kHz to 40 GHz

Analog Devices ADRF5721 Product Info

10 February 2026 5

Features

Ultrawideband frequency range: 9 kHz to 40 GHz
Attenuation range: 2 dB steps to 30 dB
Low insertion loss
- 1.6 dB to 18 GHz
- 2.0 dB to 26 GHz
- 3.4 dB to 40 GHz
Attenuation accuracy
- ±(0.1 + 1.0%) of attenuation state up to 18 GHz
- ±(0.1 + 2.5%) of attenuation state up to 26 GHz
- ±(0.6 + 10.0%) of attenuation state up to 40 GHz
Typical step error
- ±0.15 dB to 18 GHz
- ±0.20 dB to 26 GHz
- ±0.60 dB to 40 GHz

High input linearity
- P0.1dB insertion loss state: 30 dBm
- P0.1dB other attenuation states: 26 dBm
- IP3: 50 dBm typical
High RF input power handling: 26 dBm average, 30 dBm peak
Tight distribution in relative phase
No low frequency switching spurs
SPI and parallel mode control, CMOS/LVTTL compatible
RF amplitude settling time (0.1 dB of final RF output): 8.5 μs
2.5 mm × 2.5 mm, 16-terminal LGA package
Pin compatible with ADRF5731, fast switching version

Part details & applications

The ADRF5721 is a silicon, 4-bit digital attenuator with a 30 dB attenuation control range in 2 dB steps.

This device operates from 9 kHz to 40 GHz with better than 3.4 dB of insertion loss. The ATTIN port of the ADRF5721 has a radio frequency (RF) input power handling capability of 26 dBm average and 30 dBm peak for all states.

The ADRF5721 requires a dual supply voltage of +3.3 V and −3.3 V. The device features serial peripheral interface (SPI), parallel mode control, and complementary metal-oxide semiconductor (CMOS)-/low voltage transistor to transistor logic (LVTTL)-compatible controls.

The ADRF5721 is pin compatible with the ADRF5731, the fast switching version, which operates from 100 MHz to 40 GHz.

The ADRF5721 RF ports are designed to match a characteristic impedance of 50 Ω.

The ADRF5721 comes in a 16-terminal, 2.5 mm × 2.5 mm, RoHS compliant, land grid array (LGA) package and operates from −40°C to +105°C.

Applications

Industrial scanners
Test and instrumentation
Cellular infrastructure: 5G millimeter wave
Military radios, radars, electronic counter measures (ECMs)
Microwave radios and very small aperture terminals (VSATs)

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